Nucleus was located in the center of atom
The positive charge of atom or protons and the major mass of atom were located in the small volume. The atomic theory of Rutherford consists of following points: Based on this result, Ernest Rutherford made the new atomic theory to explain the better model of atom. Thomson which described atom model as the plum pudding. These points above certainly opposed the atomic theory of J.J. It also showed that the volume of positive charge in the atom is very small if we compared to the overall atom volume. Only small parts of alpha particles were deflected back or had the deflection angle of 180 degree. The positive charge in atom is placed in the small volume. It showed that there were positive charge in the atom and they were not in uniform distribution. There were some parts of alpha particles which were deflected by gold foil in small angles. It showed that the most part of atom is the empty space The major part of the alpha particles which was struck to the gold foil would pass through it without deflections. Thomson.īased on the experiment that he performed, Rutherford concluded some points regarding the structure of atom as follow: This screen itself could freely move so that it can detect any alpha particles which were deflected by the thin gold foil. Then, he made the report about his experiment which opposed the atomic model of J.J. This kind of light burst can be seen with the microscope which was placed in the back of the screen. Any alpha particles which hit the fluorescent screen, it would make the light burst or scintillation. To observe the cause of this deflection, he put the screen of fluorescent zinc sulfide around the gold foil. However, there were few alpha particles which are deflected back. This experiment resulted that most of the alpha particles passed through the gold foil. He got the alpha particles from the radioactive source and these particles attacked the gold foil with the thickness of only 100 nano meter. In his experiment, he did bombarding the thin gold sheet with the alpha particles and saw the directions of alpha particles after made interaction with the gold sheet. He then did the great experiment which explained the flaws in the JJ Thomson’s atomic model. They tried to prove that the atomic model of plum pudding was actually not true in describing the real model of atom. One of the successor of atomic theory of JJ Thomson was Rutherford. He could not describe his point about the uniform mass distribution of atom in the exact experiment.īased on this fat, other scientists tried to conduct more experiment to test his atomic model. Thomson has some limitations. The plum pudding model proposed by the J.J. He also concluded some electron properties including electron’s moving path in straight line, electron’s kinetic energy and other useful points. He believed that the mass of the atom was uniformly distributed. The raisins represented the negative charge electron while the dough represented the positive charge of atom. Based on this experiment, he released the concept of atom model as the plum pudding. He represented the cathode rays as the negative charge. 
He did the experiment using the cathode ray.
In 18977, J.J Thomson successfully discovered the electron part in the atom.
Scientists Who Contributed to The Atomic Theory.
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